Faster trains are finally coming to the United States, in cities like Los Angeles, Miami, Houston, and Las Vegas. Where will they appear next?

While countries like Japan, China, Germany, France, and others have been running trains that regularly reach around 200 miles an hour for decades, the U.S. has been notoriously slow to adapt the same technology. That’s finally starting to change—not without its fair share of controversy, inflated budgets, and blown schedules, though.

We’ve assembled a list of up-and-coming high-speed rail hotspots in the United States–including places where the systems are under construction, as well as possible sites for development. Granted, there are plenty more possibilities other than those listed here. This is just the beginning.

Los Angeles—San Francisco

Why it’s a great idea: This plan, which is already in motion, represents a perfect situation for high-speed rail: Two major metropolitan areas that are commercial and cultural hubs, but that aren’t super far away. It’s the same scheme that’s worked for high-speed rail hotspots the world over, like Tokyo to Osaka and Cologne to Frankfurt. That’s key for HSR routes: They need to be two major cities, and be close enough that faster, cheaper land transport that could make an air route obsolete.